package com.keldian.mobilesafe.service;


import java.io.InputStream;
import java.io.ObjectInputStream;

/**
 * 火星地球坐标转化.地图坐标修偏
 */
public class ModifyOffset {
    private static ModifyOffset modifyOffset;
    static double[] X = new double[660 * 450];
    static double[] Y = new double[660 * 450];


    private ModifyOffset(InputStream inputStream) throws Exception {
        init(inputStream);
    }

    public synchronized static ModifyOffset getInstance(InputStream is) throws Exception {
        if (modifyOffset == null) {
            modifyOffset = new ModifyOffset(is);
        }
        return modifyOffset;
    }

    public void init(InputStream inputStream) throws Exception {
        ObjectInputStream in = new ObjectInputStream(inputStream);
        try {
            int i = 0;
            while (in.available() > 0) {
                if ((i & 1) == 1) {
                    Y[(i - 1) >> 1] = in.readInt() / 100000.0d;
                } else {
                    X[i >> 1] = in.readInt() / 100000.0d;
                }
                i++;
            }
        } finally {
            if (in != null)
                in.close();
        }
    }

    // standard -> china
    public PointDouble s2c(PointDouble pt) {
        int cnt = 10;
        double x = pt.x, y = pt.y;
        while (cnt-- > 0) {
            if (x < 71.9989d || x > 137.8998d || y < 9.9997d || y > 54.8996d)
                return pt;
            int ix = (int) (10.0d * (x - 72.0d));
            int iy = (int) (10.0d * (y - 10.0d));
            double dx = (x - 72.0d - 0.1d * ix) * 10.0d;
            double dy = (y - 10.0d - 0.1d * iy) * 10.0d;
            x = (x + pt.x + (1.0d - dx) * (1.0d - dy) * X[ix + 660 * iy] + dx
                    * (1.0d - dy) * X[ix + 660 * iy + 1] + dx * dy
                    * X[ix + 660 * iy + 661] + (1.0d - dx) * dy
                    * X[ix + 660 * iy + 660] - x) / 2.0d;
            y = (y + pt.y + (1.0d - dx) * (1.0d - dy) * Y[ix + 660 * iy] + dx
                    * (1.0d - dy) * Y[ix + 660 * iy + 1] + dx * dy
                    * Y[ix + 660 * iy + 661] + (1.0d - dx) * dy
                    * Y[ix + 660 * iy + 660] - y) / 2.0d;
        }
        return new PointDouble(x, y);
    }

    // china -> standard
    public PointDouble c2s(PointDouble pt) {
        int cnt = 10;
        double x = pt.x, y = pt.y;
        while (cnt-- > 0) {
            if (x < 71.9989d || x > 137.8998d || y < 9.9997d || y > 54.8996d)
                return pt;
            int ix = (int) (10.0d * (x - 72.0d));
            int iy = (int) (10.0d * (y - 10.0d));
            double dx = (x - 72.0d - 0.1d * ix) * 10.0d;
            double dy = (y - 10.0d - 0.1d * iy) * 10.0d;
            x = (x + pt.x - (1.0d - dx) * (1.0d - dy) * X[ix + 660 * iy] - dx
                    * (1.0d - dy) * X[ix + 660 * iy + 1] - dx * dy
                    * X[ix + 660 * iy + 661] - (1.0d - dx) * dy
                    * X[ix + 660 * iy + 660] + x) / 2.0d;
            y = (y + pt.y - (1.0d - dx) * (1.0d - dy) * Y[ix + 660 * iy] - dx
                    * (1.0d - dy) * Y[ix + 660 * iy + 1] - dx * dy
                    * Y[ix + 660 * iy + 661] - (1.0d - dx) * dy
                    * Y[ix + 660 * iy + 660] + y) / 2.0d;
        }
        return new PointDouble(x, y);
    }

}

class PointDouble {
    double x, y;

    PointDouble(double x, double y) {
        this.x = x;
        this.y = y;
    }

    public String toString() {
        return "x=" + x + ", y=" + y;
    }
}
